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John Deere Tractors Discussion Forum
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Flywheel Bolts What Grade?

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NortexJD

07-01-2006 12:05:44




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I am replacing a cracked flywheel on my styled A. I want to put some good clamping bolts in there. What grade bolts do I use use? Would new bolts from Deere be as good as a grade 8 from Tractor Supply? Anyone know the torque specs?




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Duane Larson

07-02-2006 10:40:21




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 Re: Flywheel Bolts What Grade? in reply to NortexJD, 07-01-2006 12:05:44  
I got my flywheel bolts 8H2251R from Correct Connection, email [email protected]. They have the proper size square head (for my unstyled A, G) to keep the bolt from turning in the flywheel, and the proper heavy nut which fits the flywheel wrench. The bolt head has the usual 3 lines indicating grade 5, and has a raised E5 on the head. Don't remember the cost but it seemed reasonable at the time.

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Glen in TX

07-02-2006 08:52:15




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 Re: Flywheel Bolts What Grade? in reply to NortexJD, 07-01-2006 12:05:44  
Get the bolts from JD or a "reputable" bolt supplier but beware many of those suppliers have been selling import counterfeit grade bolts under brand names for years in the U.S. Lawsuits from truck steering gears coming off a frame causing a accident because of counterfeit grade bolts have proven it before. If they can't supply you with a chart that shows the bolt head markings for those counterfeit bolts then theirs probably are just that. These JD flywheel wrenches will work if you don't have one and always some for sale on ads. A cheater pipe on the wrench is NOT needed either! Important part as Greg said is to have a clean crank and clean flywheel splines that are not worn and be sure to get the tall groove with pin aligned correctly. You don't need lots of oil, grease or no-seize on it or it won't stay tight.
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jdemaris

07-02-2006 06:12:45




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 Re: Flywheel Bolts What Grade? in reply to NortexJD, 07-01-2006 12:05:44  
My experience with bolts isn't exactly based on scientific data. But . . . I'm finding the hardware that Tractor Supply Co. sells to be poor quality. The grade system is based in each class meeting minimum specs. I'm not sure if the TSC stuff even does that. Last Deere dealership I worked at - we got in the habit of buying all our stronger hardware (grade 8, 9, and 10) direct from Deere Company. Deere claimed at the time - that they manufactured their own hardware and it all far exceeds minimum specs. I beleive it - never had a problem. Same goes for CAT hardware. And - I buy a lot of stuff from McMaster-Carr, MSC, and ENCO - and no problems with them either. Fastenal is way overpriced. But - the TSC stuff? Their grade 8 stuff seems to break pretty easy and the threads stretch. I will no longer use it. Before TSC came to town, the store was Central Tractor and their stuff seemed to be much better.

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NortexJD

07-01-2006 22:27:37




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 Re: Flywheel Bolts What Grade? in reply to NortexJD, 07-01-2006 12:05:44  
Thanks guys. I'm going to use the fine thread grade 8. I got this used flywheel off e-bay and it looks pretty decent. Does anyone know what the height of the splines are on the original new flywheel? This one of course has some wear but the splines appear to be about an eighth of an inch high.



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Skyhawk Greg

07-01-2006 19:00:32




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 Re: Flywheel Bolts What Grade? in reply to NortexJD, 07-01-2006 12:05:44  
NJD - Make sure that you degrease all of the mating spline surfaces before putting the new flywheel on. Remember to set your endplay clearance on the crank before tightening the bolts. Do you have a flywheel wrench? If not, it is really worth the money to have one. Retighten the bolts after a short while of running.



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buickanddeere

07-01-2006 18:52:55




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 Re: Flywheel Bolts What Grade? in reply to NortexJD, 07-01-2006 12:05:44  
Use a torque wrench. Even a 3/4" grade 8 bolt can be stretched by Bubba jumping on the end of a 4ft cheater bar.



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Dan in Ohio

07-01-2006 13:22:15




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 Re: Flywheel Bolts What Grade? in reply to NortexJD, 07-01-2006 12:05:44  
NortexJD, Have used a fine thread grade 8 with extra tall nuts on my 70 D's. Also tried the grade 8 bolts and hardened nuts from TSC and after removing them I noticed the treads seemed stretched. The most important thing is a good tight fit on the splines of the crank and flywheel.



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WeirdDeere

07-01-2006 14:21:20




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 Re: Flywheel Bolts What Grade? in reply to Dan in Ohio, 07-01-2006 13:22:15  
Dan,

Where did you get those fine thread grade 8 with extra tall nuts? I will need a set for my 70D!

Brandon



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Dan in Ohio

07-01-2006 16:53:42




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 Re: Flywheel Bolts What Grade? in reply to WeirdDeere, 07-01-2006 14:21:20  
Brandon, I got them from: Lilly Industries Inc. 6437 County Rd. 20 Mt. Gilead, Ohio 43338 Phone 419-946-7908
Just call and tell them what you need. I think the bolt was alittle longer than the specs call for.



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F-I-T

07-01-2006 16:34:47




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 Re: Flywheel Bolts What Grade? in reply to WeirdDeere, 07-01-2006 14:21:20  
Brandon:

Fastenall can get them, Mcmaster Carr has them, and you can order them from Albert @ Renaissance Tracotr as well.

Frank



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